Cecil, a bunch of us here can relate to your Dad. Bing, George, and a few others come to mind.
I recently left our bedroom and went to the other end of the house. When I got there, I couldn't remember why I was there. So, I went back to the bedroom to try to figure it out. Then I remembered that I went to use the hall bathroom. Of course, there is also one next to the bedroom.
I bet I have a dozen pairs of cheapo reading glasses and there is never a pair where I need them. When I go to find a pair, I sometimes get distracted by a job that I need to finish. Then I don't remember what I was doing before I got distracted.
I could relate a lot more stuff like that. It's a pretty common thing for those of us who have more years behind than in front of us. I laugh about it but my Wife sometimes gets peeved. As my Wife says, Dave has outlived his memory.